import os
import logging
import abc
from typing import Dict, List, Optional, Any, Union, Tuple

# 配置日志
logger = logging.getLogger(__name__)

class KMSProvider(abc.ABC):
    """云端KMS服务提供者抽象基类"""
    
    @abc.abstractmethod
    def get_key(self, key_id: str) -> bytes:
        """
        从KMS服务获取密钥
        
        Args:
            key_id: 密钥ID
            
        Returns:
            bytes: 密钥数据
        """
        pass
    
    @abc.abstractmethod
    def create_key(self, name: str, description: str = "") -> str:
        """
        在KMS服务中创建新密钥
        
        Args:
            name: 密钥名称
            description: 密钥描述
            
        Returns:
            str: 新密钥ID
        """
        pass
    
    @abc.abstractmethod
    def rotate_key(self, key_id: str) -> str:
        """
        在KMS服务中轮换密钥
        
        Args:
            key_id: 要轮换的密钥ID
            
        Returns:
            str: 新密钥ID
        """
        pass
    
    @abc.abstractmethod
    def list_keys(self) -> List[Dict[str, Any]]:
        """
        列出KMS服务中的所有密钥
        
        Returns:
            List[Dict[str, Any]]: 密钥列表，每个密钥包含id、name、创建时间等信息
        """
        pass
    
    @abc.abstractmethod
    def delete_key(self, key_id: str) -> bool:
        """
        从KMS服务中删除密钥
        
        Args:
            key_id: 要删除的密钥ID
            
        Returns:
            bool: 删除是否成功
        """
        pass

class AzureKeyVaultProvider(KMSProvider):
    """Azure Key Vault KMS提供者"""
    
    def __init__(self, vault_url: str, tenant_id: str, client_id: str, client_secret: str):
        """
        初始化Azure Key Vault提供者
        
        Args:
            vault_url: Azure Key Vault URL
            tenant_id: Azure AD租户ID
            client_id: Azure AD应用客户端ID
            client_secret: Azure AD应用客户端密钥
        """
        self.vault_url = vault_url
        self.tenant_id = tenant_id
        self.client_id = client_id
        self.client_secret = client_secret
        
        # 这里只是预留接口，实际实现需要安装Azure SDK
        # from azure.identity import ClientSecretCredential
        # from azure.keyvault.secrets import SecretClient
        # from azure.keyvault.keys import KeyClient
        
        logger.info(f"Azure Key Vault提供者初始化: {vault_url}")
    
    def get_key(self, key_id: str) -> bytes:
        """从Azure Key Vault获取密钥"""
        # 实际实现需要使用Azure SDK查询密钥
        # credential = ClientSecretCredential(self.tenant_id, self.client_id, self.client_secret)
        # key_client = KeyClient(vault_url=self.vault_url, credential=credential)
        # key = key_client.get_key(key_id)
        # ...
        
        logger.info(f"从Azure Key Vault获取密钥: {key_id}")
        raise NotImplementedError("Azure Key Vault集成尚未实现")
    
    def create_key(self, name: str, description: str = "") -> str:
        """在Azure Key Vault中创建新密钥"""
        # 实际实现需要使用Azure SDK创建密钥
        logger.info(f"在Azure Key Vault中创建密钥: {name}")
        raise NotImplementedError("Azure Key Vault集成尚未实现")
    
    def rotate_key(self, key_id: str) -> str:
        """在Azure Key Vault中轮换密钥"""
        # 实际实现需要使用Azure SDK轮换密钥
        logger.info(f"在Azure Key Vault中轮换密钥: {key_id}")
        raise NotImplementedError("Azure Key Vault集成尚未实现")
    
    def list_keys(self) -> List[Dict[str, Any]]:
        """列出Azure Key Vault中的所有密钥"""
        # 实际实现需要使用Azure SDK列出密钥
        logger.info("列出Azure Key Vault中的所有密钥")
        raise NotImplementedError("Azure Key Vault集成尚未实现")
    
    def delete_key(self, key_id: str) -> bool:
        """从Azure Key Vault中删除密钥"""
        # 实际实现需要使用Azure SDK删除密钥
        logger.info(f"从Azure Key Vault中删除密钥: {key_id}")
        raise NotImplementedError("Azure Key Vault集成尚未实现")

class HashiCorpVaultProvider(KMSProvider):
    """HashiCorp Vault KMS提供者"""
    
    def __init__(self, vault_url: str, token: str, mount_point: str = "secret"):
        """
        初始化HashiCorp Vault提供者
        
        Args:
            vault_url: HashiCorp Vault URL
            token: Vault认证令牌
            mount_point: 密钥存储挂载点
        """
        self.vault_url = vault_url
        self.token = token
        self.mount_point = mount_point
        
        # 这里只是预留接口，实际实现需要安装hvac (HashiCorp Vault API Client)
        # import hvac
        # self.client = hvac.Client(url=vault_url, token=token)
        
        logger.info(f"HashiCorp Vault提供者初始化: {vault_url}")
    
    def get_key(self, key_id: str) -> bytes:
        """从HashiCorp Vault获取密钥"""
        # 实际实现需要使用hvac客户端查询密钥
        # secret = self.client.secrets.kv.v2.read_secret_version(
        #     path=key_id,
        #     mount_point=self.mount_point
        # )
        # ...
        
        logger.info(f"从HashiCorp Vault获取密钥: {key_id}")
        raise NotImplementedError("HashiCorp Vault集成尚未实现")
    
    def create_key(self, name: str, description: str = "") -> str:
        """在HashiCorp Vault中创建新密钥"""
        # 实际实现需要使用hvac客户端创建密钥
        logger.info(f"在HashiCorp Vault中创建密钥: {name}")
        raise NotImplementedError("HashiCorp Vault集成尚未实现")
    
    def rotate_key(self, key_id: str) -> str:
        """在HashiCorp Vault中轮换密钥"""
        # 实际实现需要使用hvac客户端轮换密钥
        logger.info(f"在HashiCorp Vault中轮换密钥: {key_id}")
        raise NotImplementedError("HashiCorp Vault集成尚未实现")
    
    def list_keys(self) -> List[Dict[str, Any]]:
        """列出HashiCorp Vault中的所有密钥"""
        # 实际实现需要使用hvac客户端列出密钥
        logger.info("列出HashiCorp Vault中的所有密钥")
        raise NotImplementedError("HashiCorp Vault集成尚未实现")
    
    def delete_key(self, key_id: str) -> bool:
        """从HashiCorp Vault中删除密钥"""
        # 实际实现需要使用hvac客户端删除密钥
        logger.info(f"从HashiCorp Vault中删除密钥: {key_id}")
        raise NotImplementedError("HashiCorp Vault集成尚未实现")

# 工厂函数，用于创建KMS提供者实例
def create_kms_provider(provider_type: str, **kwargs) -> KMSProvider:
    """
    创建KMS提供者实例
    
    Args:
        provider_type: 提供者类型，"azure"或"hashicorp"
        **kwargs: 提供者特定的参数
        
    Returns:
        KMSProvider: KMS提供者实例
        
    Raises:
        ValueError: 如果提供者类型不支持
    """
    if provider_type.lower() == "azure":
        required_params = ["vault_url", "tenant_id", "client_id", "client_secret"]
        for param in required_params:
            if param not in kwargs:
                raise ValueError(f"Azure Key Vault需要参数: {param}")
        
        return AzureKeyVaultProvider(
            vault_url=kwargs["vault_url"],
            tenant_id=kwargs["tenant_id"],
            client_id=kwargs["client_id"],
            client_secret=kwargs["client_secret"]
        )
    
    elif provider_type.lower() == "hashicorp":
        required_params = ["vault_url", "token"]
        for param in required_params:
            if param not in kwargs:
                raise ValueError(f"HashiCorp Vault需要参数: {param}")
        
        return HashiCorpVaultProvider(
            vault_url=kwargs["vault_url"],
            token=kwargs["token"],
            mount_point=kwargs.get("mount_point", "secret")
        )
    
    else:
        raise ValueError(f"不支持的KMS提供者类型: {provider_type}") 